Microwave studies of the Gaussian symplectic and the chiral ensembles

高斯辛和手性系综的微波研究

• 批准号: 260221821
• 负责人: Professor Dr. Hans-Jürgen Stöckmann
• 金额: --
• 依托单位: Institut de Physique de Nice
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/260221821?language=en
• 关键词: Microwave; studies; Gaussian; symplectic; chiral

The universal properties of the spectra of chaotic systems, e.g. the spacing distribution of neighboring eigenvalues, coincide with those of random matrix ensembles with corresponding symmetries. This universality is the essence of the meanwhile proven conjecture of Bohigas, Giannoni, Schmit. Systems with time-reversal symmetry (TRS) and no spin 1/2 are described by the Gaussian orthogonal ensemble (GOE), those with spin 1/2 by the symplectic (GSE), and those with broken TRS by the unitary (GUE) ensemble.There is an abundant number of experimental realizations for the GOE and a small number for the GUE. For the GSE the first experimental realization after 50 years of random matrix theory (RMT) had been achieved by us in the present project in a microwave graph, a network with peculiar symmetries mimicking a spin 1/2 system.In the continuation of this project we plan to study the scattering properties of GSE graphs. Apart from a first experiment in our group described in this application, this is a completely new field of research. Also RMT, well established for the GOE and the GUE, still has to be developed in mayor parts for the GSE.For systems with particle-antiparticle symmetries three new random matrix ensembles appear, the chiral GOE, GUE, GSE, respectively. In our first application we proposed to realize the chiral GOE in a microwave equivalent of graphene set up by dielectric cylinders. For reasons described in the application we decided to change to a much simpler system, which already exhibits chiral symmetry, the linear chain.The ongoing experiments already demonstrate that we had been successful in the realization of the chiral GOE. In the prolongation we plan to extend the studies to the chiral GUE and the chiral GSE. The main objective of this project including its prolongation is the first experimental realization of four of the ten random matrix ensembles.By means of a combination of an externally driven diode with a T junction non-stationary graphs may be generated. Using periodic time dependencies in a GSE graph we plan to realize a microwave equivalent of spin resonance. Even an equivalent of spin relaxation can be established by applying in addition a stochastically varying time-dependence. This would open a new access to the test of spin relaxation theories.

混沌系统的谱的普适性质，如相邻特征值的间距分布，与具有相应对称性的随机矩阵系综的谱的普适性质一致。 这一普遍性的本质是 同时证明了Bohigas，Giannoni，Schmit的猜想。具有时间反演对称性（TRS）且自旋不为1/2的系统用高斯正交系综（GOE）描述，自旋为1/2的系统用辛系综（GSE）描述，而TRS破缺的系统用酉系综（GUE）描述，GOE的实验实现数很多，而GUE的实验实现数很少。 对于GSE，我们在本项目中实现了随机矩阵理论（RMT）50年后的第一个实验实现，即在微波图中实现，这是一个具有特殊对称性的网络，模仿自旋1/2系统。在这个项目的继续中，我们计划研究GSE图的散射特性。除了本申请中描述的我们小组的第一个实验之外，这是一个全新的研究领域。 对于具有粒子-反粒子对称性的体系，出现了三种新的随机矩阵系综：手征GOE，GUE，GSE.在我们的第一个应用程序中，我们提出了实现手性GOE在微波等效的石墨烯介电圆柱体设置。 由于申请中描述的原因，我们决定改变为一个更简单的系统，它已经表现出手性对称性，线性链。正在进行的实验已经证明，我们已经成功地实现了手性GOE。 在延长期内，我们计划将研究扩展到手性GUE和手性GSE。 这个项目的主要目标包括它的扩展是第一次实验实现的四个十个随机矩阵ensembles.By外部驱动二极管与T结的组合，可以产生非平稳图形。 利用GSE图中的周期性时间依赖关系，我们计划实现自旋共振的微波等效。甚至自旋弛豫的等价物也可以通过另外应用随机变化的时间依赖性来建立。这将为自旋弛豫理论的检验开辟一条新的途径。

项目成果

Microwave Realization of the Gaussian Symplectic Ensemble.

• DOI: 10.1103/physrevlett.117.064101
• 发表时间: 2016-01
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: A. Rehemanjiang;M. Allgaier;M. Allgaier;Christopher H. Joyner;Sebastian Müller;Martin Sieber;Ulrich Kuhl;Ulrich Kuhl;Hans-Jürgen Stöckmann

Microwave Realization of the Chiral Orthogonal, Unitary, and Symplectic Ensembles.

手性正交、酉和辛系综的微波实现

• DOI: 10.1103/physrevlett.124.116801
• 发表时间: 2020
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: A. Rehemanjiang